Synonyms of o's

1 Syllable
birr, go, o, life, dash, might, fire
2 Syllables
moxie, force, juice, muscle, drive, ardor
3 Syllables
hardihood, exertion
4 Syllables
intensity, liveliness, enterprise, endurance, efficacy, activity, forcefulness, application, animation, efficiency, fortitude
5 Syllables
initiative, effectiveness